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(NoModelJ 4 E. R. BLOOD & S. P. WENSTRAN.

LAMP BLACK MACHINE. No. 403,174. Patented May 14, 1889.

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UNITED STATES PATENT OFFICE.

ERASTUS R. BLOOD AND Si/VAN P. WENSTRAN, OF LUDLO'W, PENNSYLVANIA, ASSIGNORS TO MARTHA P. BLOOD, OF SAME PLACE.

LAMP-BLACK MACHINE.

SPECIFICATION forming part of Letters Patent No. 403,174, dated May 14, 1889.

Application filed October 29, 1888. Serial No. 289,465. (No model.)

To all whom it may concern.-

Be it known that we, ERASTUS R. BLOOD and SWAN PETER WENSTRAN, citizens of the United States, residing at Ludlow, in the county of McKean and State of Pennsylvania,

have invented certain new and useful Improvements in Lamp-Black Machines; and we do hereby declare the following to be a full, clear, and exact description of the invention,

IO such as will enable others skilled in the art to which it appertains to make and use the same.

Our invention relates to machines for making lamp-black; and it consists in certain improvements in the same, as will be hereinafter :5 fully set forth, and pointed out in the claims.

Our invention relates particularly to the construction of the condensing or deposit plate of that class of lamp-black machines wherein a condensing-plate is held above the flame from a gas burner or lamp, and the lamp-black is deposited on the said plate as the flame impinges upon it.

The leading feature of our invention consists in providing the condensing-plates of the 2 5 class of lamp-black machines just named with a vent through the plate, for the escape from the central part of the flame of the products of combustion which do not deposit upon the plate. The carbon which forms the lampblack, when condensed, abounds most in the exterior of a flame,while the gases which will not be deposited upon the condensing-plate abound most in the center of a flame. It is the products of combustion which are most 3 5 voluminous in the center of the flame, and the residuum products which we provide a vent for through the plate. Vi e have found that when the depositing-plate is not provided with avent through it from the central part of the flame the escaping gases tend to hold the undecomposed part of the flame away from the plate and so prevent deposition, and we have found that When the plate is perforated at the central part of the flame the escaping gases will pass through the opening, and the fresh flame is unobstructed in its impingement upon the plate and the deposit is greatly increased.

To secure the fruits of our discovery, the essential feature of construction is that the condensing-plate be provided with a vent through it from the central part of the flame, and a secondary feature is that means be provided for keeping the said vent open.

In the accompanying drawings we show one 7 form of construction by which our discovery can be practiced, and from this persons acquainted with the art will readily understand our invention and its application to the various types of machines to which it is applicable.

In the drawings above referred to our invention is illustrated as follows: Figure 1 is a perspective view of a depositing-plate embodying our invention. Fig. 2 is a transverse sectional view on the line was in Fig. 1. Fig. 3 is a transverse sectional view on the line y 3 in Fig. 1.

Ais the gas-supply pipe; ct, the gas-burners; B B, the depositing-plate or condensing-plate; b, the escape-vent through the plate B for the central part of the flame; O, a superimposed secondary plate, and D a traveler for keeping the vent b from filling up.

In Fig. 3 the action of the flame is illustrated. The condensing-plate, in the construction shown, is composed of two plane bars of iron placed so as to leave a narrow slot or opening, b, between them directly over the line of burners a a a, &c. It will be seen by reference to Fig. 3 that the slot 1) is over the central part of the flame, and the escaping 8o gases are shown passing up through the slot. The traveler D will be moved to and fro by any means desirable, and will keep the slot open. Ordinarily the traveler will be moved by the scraping mechanism, which is not shown, as it is not material to an illustration of our invention.

The secondary plate 0 is not essential. It may be omitted entirely, or it may be a small rod. It serves to keep the travelerD in place, 0 and if it is wide, as shown, it will serve to condense any carbon that may escape through the slot 1).

We intend in another application to claim the process of making lamp-black herein dis- 9 5 closed.

What we claim as new is 1. In a lamp-black machine, the combination, with a condensing-plate having a vent or slot through it directly over the center of the loo flame for the escape of non-condensed pro- In testimony whereof We affix our signatures ducts of combustion, of a secondary plate supin presence of two Witnesses. ported above said vent. FRASTUS R BLOOD .t. In (L lamp black machlnc, the comblna SWAN R FENSTRAN' 5 tion, with a condensing-plate having through it a vent for the escape of the non-condensed WVitnesses: products of combustion, of a clearer forkeep- A. F. J ONES, ingthe said vent open. ALTA R. BLOOD. 

